All the factory replacement corrosion-resistant parts to complete your P320 slide minus barrel sights and recoil assembly. Includes: Extractor Extractor Pin Extractor spring Extractor spring pin Striker group assembly Rear slide cap. Installation of these parts kits requires disassembly of your firearm beyond a field-stripped condition. Improper installation may result in malfunction serious injury or death. SIG SAUER requires that only certified SIG SAUER armorers install these parts kits. Any damage caused by the incorrect installation of these parts kits are not covered by your firearms warranty and SIG SAUER will charge for any needed repairs to a firearm damaged by improper use or installation of these parts kits.